Bartholomew oehmen



(No Modem GB. BHMEN ICOMBINED TELEGRAPH'KBY AND SOU'NDBR. l A No.877,862." Patented Feb'. 14, 11888.

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vs a wY PETERS. mmnnamgw, washing-.1, nA c UNITED STATES PATENT @Erica iEAETHOLOMEW OEEMEN, OE NEw YORK, EL Y., AssreNOE rro THE NEw HAVEN CLOCKCOMPANY, OE sAME PLACE.

COMBINED TELEGRPH KEY AND SOUNDER.

SPECIFICATION forming part of Letters Patent ivo. 377,862, datedFebruary 14, 1888.

Application filed October 13, 1887. Serial No. 252,206. (No model.)

To @ZZ whom it may concern,.- Y-

Beit known that I, BARTHOLOMEW OEHMEN of the city, county, and State ofNew York, have invented a new and Improved Combined Telegraph Key andSounder, of which the following is a specicat-ion.

The object of my invention is to combinein one instrument a telegraphkey and sounder, which instrument shall be simple in construction, takeup but little space, and be not liable to get out of order.

The invention consists in the combinations and details of construction,hereinafter` more fully set forth.

Reference' is to be had to the accompanying drawings, forming part ofthis specification, in which Figure l is a vertical longitudinal sectionon the line c c, Fig. 2, of a combined key and sounder constructedaccording to my invention. Fig. 2 is a planview of the same. Fig. 3 is avertical section through part of the key and its guide-post; and Fig.r4is a vertical crosssection on the line k k, Fig. l, showing the post inwhich the key-lever is'pivoted.

A represents a plate of suitable conducting metal, which may be mountedupon a base, H, of wood orotlicr non-conductor, in any suitable manner.

B B are electro-magnets secured to the plate A or base H. One of thepoles of this electro-.magnet is in electrical connection with saidplateA, and the other pole with an insulated binding-post, b, ofline-wire y.

d is the armature of the electro-magnets, carried by a lever, e, whichlever is pivoted in a post or upright, f, that projects from the plateA.

D is the sounding-post carried by the plate A. It preferably carries astud or anvil, g, upon its upper' end, which the lever eis to strike toproduce a clicking sound. The post D also carries, or may carry, on aprojection thereon, an upwardly-projecting guidepin, h, which passesthrough a slot of the lever e. The pin h carries above the lever e nutsto limit and regulate the upward movement of said lever.4

The armature-lever eis kept in the raised position by means of a wirespring, t', one arm of which is inserted in one of al series of holes inthe post f, its other arm connecting with a screw, j, which is carriedby the lever e, as shown. By this screw the tension ofthe spring vi isregulated to a subordinate extent, while it isY regulated to a-v greaterextent by inserting lthe end of the spring in a different hole of thepost-f. I prefer that one end of the spring t project into a depressionin the end of the screw j, to insure that the spring will remain in itsproper position against the screw. This is'shown in Fig. l.

I have described my preferred form of mechanism for a sounder; but anyother construction of sounder mechanism may be used, if desired. I havealso shown two coils of electro-magnet B; but one or more may be used',as may best suit convenience.

I will now proceed to show how the key is combined with the sounder. j

E is a key-lever of suitable construction pivoted in the post D by meansof a pin or 'other pivot, l. The post D is shownin Fig. 4 to be arched,and the end of the lever. E passes into said arch, where it is pivoted;butk the lever E may be supported in any other form of post D. The leverE is held in its proper normal position by means of a spring, m, bearingat one end against the lever or against a set-screw, n, carried bysaidlever, and at its other end against the plate A or a projectiontherefrom, or against any other'suitable support. This spring m'could,if desired, be adjusted in a manner similar to the' spring i that is,have one of its ends supported by the post D.

o is an upwardly-projecting guide-pin carried by the plate A and passingthrough a l porting-post for the lever E. It is evident that the lever Ecould be pivoted in the post f to substantially the same advantage. Theplate A serves, also, as the main support for roo v sounder and key,and, as I will now show, as single conductor for both these instruments.

F is an anvil or contact-post carried by the base H out of metalliccontact with the plate A. In the drawings it is shown projecting throughthe plate A and insulated therefrom. The anvil F is in electricalconnection with an insulated binding-post, r, and conductor e by meansof a wire, s; but, if desired, the anvil may be connected directly tothe linewire. The anvil F is carried beneath the lever E, and it isadapted to be struck by the lever E to close the circuit by the key. Theanvil F is brought into electrical connecsion with the plate A by meansof a sliding twitch, G, carried by and in contact with said plate. Theswitch G is preferably held in position on the plate A by means of ascrew, t, passing through a slot, u, in the switch, and thence into theplate A. By means of this slot the switch is permitted longitudinalmovement. The opposite or free end of the switch is forked, as seen inFig. 2, and when moved forward it is adapted to straddle the anvil F andcome in contact with the shoulderw thereof, as shown in dotted lines,Fig. 2. The pin o may also project through the fork of the switch tohelp guide said switch on the plate A. The switch is provided with afingerpiece, o, for convenience in operating. To close the circuit vforthe sounder, the switch is moved forward to contact the anvil F, asshown in dotted lines, Fig. 2. The switch G could be made to contact anyother insulated binding-post instead of the anvil, and thereby to bringthe sounder into circuit; but the construction shown I prefer assimplifying the arrangement. In operating the key the switch G williirst be moved out of contact with the anvil.

An instrument constructed as above described will take up but littleroom, and will not be liable to get ont of order, as it is made withcomparatively few parts. It will be seen that the same conductors arecapable of use with the key as with the sounder. The key, whendepressed, connects the anvil metallically with the plate A, wire ofcoil B, post b, and conductor y, the anvil uniting with conductor e. Thesounder, when the switch is closed, also uses the conductors y and z.

Having now described my invention, what 1. The combination of the plateA, postf, having series of holes, pivoted lever e, and spring i,inserted at one end in one of the perforations of said post f andbearing 'at its other end upon the lever e, whereby the tension of saidspring is regulated, substantially as described.

2. The combination ofthe plate A with the anvil F, for connection with aline-wire, said anvil having a shoulder, x, above the plate A, and withthe slotted and forked longitudinally-sliding switch G and guide-poststand o, entering said slots and fork, respectively, substantially asdescribed.

3. The combination of the metal plate A, electro-magnet I3, one polebeing electrically connected with the plate A, sounder-lever e, andsounder-postsf and D with the key-lever E, pivoted in the sounder-post,longitudinallysliding switch G, insulated anvil F, conductors s r z andb y, all arranged so that both said conductors are used by the key andby the sounder, as specified.

B. OEHMEN.

Witnesses:

CHARLES G. M.. THOMAS, GUsTAv SCHNEPP.

